Starting and stopping mechanism



(NoMod e1.) 1

C. H. FOGG.

STARTING AND STOPPING MEGHANISM. lNo. 595,707. Patented Deo. 21', 1897.

r Y In'vEmur. .45x y UNTTED STATES PATENT OFFICE.

CHARLES H. FOGG, OF HYDE PARK, MASSACHUSETTS, ASSIGNOR TO JAMES W. BROOKS, PRINCIPAL TRUSTEE, OF PETERSHAM, AND JOHN BROOKS, ASSOCIATE TRUSTEE, OF CAMBRIDGE, MASSACHUSETTS.

STARTING AND STOPPING IVIECHANISM.

SPECIFICATION forming part of Letters Patent No. 595,707, dated'December 21, 1897.

Application led March 31, 1897. Serial No. 530,021. (No model.)

To all whom it may concern,.- (see Fig. 2,) which is pivoted at d, has the Beit known that I, CHARLES H. FOGG, acitiforked lower end d' to span the recess or zen of the United States, residing at Hyde groove c4, and which engages the said groove Park, in the county of Norfolk and State of or recess by means of the pins d2. The lower 5 Massachusetts, have invented a new and useend of this lever is moved inward to move the 5 5 ful Improvement in Starting and Stopping clutch-wheel C into contact with the fly-wheel Mechanism, of which the following is a full, B by the spring cl3, attached to its upper end, clear, and exact description, reference being and the said spring also serves to hold the had to the accompanying drawings, forming two members of the clutch in engagement.

1o a part of this specification, in explaining its The lever is moved to disengage the driven 6o nature. member C of the clutch from the driving mem- The invention relates to the herein deber by the cam E upon a shaft c, (see Figs. 2', scribed improvement in starting andstopping 4, and 5,) and which shaft may be revolved mechanisms Wherebyamachine is started and at a less or a greater speed than the main 15 automatically disengaged from its starting shaft, generally at a less speed. 65 devices and automatically stopped. The cam is formed on the face of a disk,

Figure l is a view, principally in vertical has the long slow rise e' ending in a sharp section, of the main shaft of a machine and rise e2, and it is cut away at e3. -(See Figs. 2 my improved devices. Fig. 2 is aview in verand 4.) The lever'D is connected with the zo tical section upon the dotted line 2 2 of Fig. cam by means of a sliding bolt 0r pin F, (see 7o l. Fig. 3 is a view of the parts represented Figs. 2 and 4,) which is mounted in ahousing in Fig. lwhen the driven member of the clutch or casing j", preferably forming a part of the is in engagement with the driving member. lever, although it may be attached thereto. Fig. 4 is a view in side elevation representing This bolt or pin Fis held in contact with the z 5 a portion of the operative devices when in the surface of the cam by the spring d3, and there- 75 position shown in Fig. 3. Fig. 5 is a detail by serves to hold, when the cam is at rest, the view, in plan, of thedevices shown in Fig. 2. driven member of the clutch from the driv- Fig. 6 is a detail view, in front elevation, of ing member of the clutch, as shown in Fig. 1. said devices. Said pin or bolt upon being drawn radially 3o A is the main shaft of the machine. from the section e2 of the cam to the position 8o B is a fly or balance wheel mounted upon represented in Figl 4 allows the. spring cl3 to the shaft to turn freely thereon and having move the driven member of the clutch into the belt-surface b and the section or part b engagement with the driving member of the of a clutch, which preferably is conical in clutchand to hold it in such engagement un- 3 5 shape, being the outer surface of a conical til the cam has been turned sufficiently to 85 chamber or cavity in the inner face of the again come into contact With the pin or bolt wall. Said shaft may also have the loose beltand move it, and thereby the lever, to the wheel Bf. There is also mounted upon the original or stopping position of both. The shaft the clutch member or wheel C. This is bolt or pin F is moved outward from the cam- 4o fast to the shaft by a feather c, upon which' surface in opposition to the stress of the re- 9o it is adapted to be moved lengthwise the shaft, turning spring f', which preferably is conand its outer conical surface c is adapted to tained within the housing f, surrounds the engage the surface b of the ily-wheel when portion of the bolt therein, bears at one end moved into contact and held in contact thereagainst the end of the bolt-holding recess in 45 with. It has in its hub the recess c2 to prothe housing and at the other end against the 95 vide room for the hub b2 ofthe fly-wheel.- The bolt, and this spring or bolt serves to return clutch-wheel C has a hub or hub extension c3, the bolt or spring into the cam-recess e3 when in which is the annular recess or groove c4, the cam has been turned sufficiently to-bring and the said clutch-wheel is moved toward the said recess into line therewith, the bolt or 50 and from the wheel B by means of a lever D, pin being by that time released from the deroo vice which moves it outward or disengages it from the cam, so that it is at liberty to be returned by the said springf' to its original or normal position. The section c4 of the cam, which is constantly turning, then runs behind the bolt or pin and coming in contact therewith causes the lever D to move the driven member of the clutch from contact with the driving member and into contact with the brake. (See Fig. l.)

The cam preferably has near its rear end a sharp rise e2, which comes into action preferably after the driven member has been disengaged from the driving member and after the momentum of the machine has been somewhat checked and serves as a sort of positive lock, at which point the machine must stop,

the driven member then being completely disengaged from the driving member and also forced hard against the brake, and the said section of the cam cannot pass beyond the pin without breaking it or some connection.

The pin or bolt F is disengaged from the cam to start the machine by means of the bellcrank lever G, which is pivoted at g to the upper end of a swinging arm or support g'. The arm g1 of the bell-crank is connected by a link g3 with a treadle. (Not shown.) The end g4 of the arm g5 is alternately connected and disconnected with the head f2 of the bolt orpin F. It is connected with said head when the machine is at rest and the parts are in the position represented in Figs. l and 2, being then behind the flat surface f3 of said head. It is allowed to take such position because of the swinging support or arm g' and the spring gG, (see Figs. l, 3, and 6,) the spring drawing the arm inward toward the frame of the machine and moving the end g4 of the bell-crank inward behind the head f2 and holdingit there not only while the machine is at rest, but also during the movement of the treadle in starting the machine, this movement of the treadle causing the end g4 of the bell-crank to press against the head of the bolt or pin and move the bolt or pin from the position represented in Fig. 2 to the position represented in Fig. 4c. The release of the treadle then permits the bell-crank to be returned to its original relation with the said head f2, the end g4 of the bell-crank riding over the rounded outer surfacef4 of the head f2 if it has not previously been released and returned. The arm or support g yielding outwardly slightly permits this to take place and then being drawn inward by its spring and drawing the end g4 of the bell-crank behind the face or shoulder f5. The treadle-lifting spring (not shown) causesthe bell-erank lever to be thus moved` backward.

It will be understood that the drawing of the pin or bolt F from the cam upon the starting of the machine changes the position of the leverD from that shown in Fig. l to that represented in Fig. 3 and that this removes the pin or bolt and its head f2 from the line upon which the end g'1 of the bell-crank lever is operative, and that an operative relation cannot again be established between them until the lever D has been restored by the cam to the position represented in Fig. l. To prevent the arm or support g' from being moved i11- ward sufficiently to make an engagement between the bell-crank and the head possible when the lever is in the position shown in Fig. 3, 'I have provided said arm or lever with a stop Q7, which is arranged Yto come into contact with the projection g8, and thereby limit the extent of the inward movement of the bell-crank. If the treadle is released after the machine has come to rest, then the end of the bell-crank will ride over the rounded end of the pin or bolt head f2 to make its new engagement therewith. If the treadle is released before the machine comes to rest and the bell-crank is returned to its original position before such time, then the head f2 will close over the end of the bell-cranl- It will be seen that by this mechanism the movement of the bell-crank causes the bolt or pin to be disengaged from the cam E and the members of the clutch to be engaged and the machine to be started, and that also the bell-crank is immediately disengaged from the head or pin because of the lateral movement of the head from it, and that continued pressure upon the treadle or bell-crank will not cause a second starting of the machine, that the machine is automatically stopped by the release of the bolt or pin F and the rengagement of the cam E therewith, and that the machine cannot be again started until the bell-crank lever has been released and permitted to return to make a new connection with the head of the bolt or pin.

The driven clutch-wheel C has upon its inner face a cavity h, which has a conical surface 7L', and this is adapted to be brought into contact with the conical surface h2 of a stationary brake-disk H when the said driven wheel C is disengaged from the driving-wheel, the said en gagem ent between the driven wheel and the brake being provided by the section e2 of the cam, which causes the lever D to move the driven wheel C backward sufliciently to bring the conical surface 7L' thereof into forcible contact with the conical surface h2 of the said brake, and the said cam serves to hold said driven wheel in contact with the brake. The brake-disk is fastened to the frame of the machine. lt is desirable that the end of the pin or bolt F which bears upon the cam be provided with anantifriction-roll.

It will 'be understood that, if desired, the

cam E and the spring d3 may be reversed in respect to their actions-that is, the 'cam may be'used to bring the driven member of the clutch into engagement with the driving member and the spring used for releasing the driven member and for moving it into c0117` tact with the brake.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States- IOD IIO

l. In a starting and stopping mechanism, the combination of a driving clutch member, a driven clutch member, a lever D connected therewith, a spring d3 to act upon the lever,

a cam E, a releasing bolt or pin F carried by the lever, a spring to move it in one direction, means for alternately engaging said pin to move the same and disengagingthe same.

2. The combination, in a starting and stopping mechanism, of a driving member of a clutch, a driven member, a lever D to move the driven member, a spring g3, lthe releasing and stop cam E, the releasing bolt or pin F carried by the lever, its spring f', a head or shoulder thereon, the engaging arm g5, means for moving the same and a swinging arm or support g upon which said arm g5 is mounted, the spring Q6 and the stop Q7, as and for the purposes described.

3. The combination of the driven member of a clutch having the recess h and conical surface h', the stationary disk H having the conical surface h2, the lever D connected with the said driven member, the cam E, as and for the purposes described.

4. The combination of the driving member of a clutch having the recess and inclined surface b', a driven member of a clutch having the exterior conical surface c, the side recess and interior conical surface h', the disk Hhaving the conical surface h2, the lever D engaging the driven member of the clutch, its spring d3, cam E, releasing pin or bolt F, its spring f and bolt moving and tripping devices.

CHAS. H. FOGG.

Witnesses:

F. F. RAYMOND, 2d, J. M. DoLAN. 

